Typical reasons
First of all, you need to check: the ignition and power systems. Carry out a check in those places that can cause the moped to move. The reasons why the scooter does not start, especially in cold weather, may be the following:
No spark in spark plug
The scooter does not start because there is no spark in the spark plug. In this case, you need to do the following: the spark plug is unscrewed and checked for suitability. Connects to the ignition coil using a wire. Placed on the cylinder. When the crankshaft rotates, the spark at the spark plug is checked. The scooter will not start if there is no spark at the plug, or there is a spark, but it is inconsistent.
Reasons for the lack of spark on the spark plug
Cold weather
The scooter may have difficulty starting in cold weather if there is a problem with the spark plug cap or its connector. In such a situation, the cap is unscrewed from the wire, and the wire is brought 0.3 cm closer to the metal motor element to crank the crankshaft.
A moped can carry current in cold weather. This happens due to the fact that there is contact with the exposed part of the wire and the metal element due to which the scooter starts.
Malfunctions in the power system
A moped may have difficulty starting in cold weather if there is a problem in the power system: lack of fuel or its excess. In this case, you need to check the following elements: gas tank, fuel tap, starting enrichment and fuel pump.
First of all, check the moped's fuel pump
Along with this, it is worth noting that the moped needs to be repaired, and parts should only be disassembled if there is complete confidence that they are faulty. It is best to install only new parts on the scooter, and not used ones, otherwise the engine, when started from the starter, will either work poorly or will not start at all.
Typical problems with the ignition system of Chinese scooters
There are times when scooter owners are faced with the problem that it will not start. The reasons for this can be different, but there are also quite typical ones. In some cases, fixing the problem takes a few minutes.
Let's look at several reasons that lead to the scooter not starting. All examples are real, obtained during the repair of the Chinese scooter ABM Storm L and Motoland VXR5 .
The scooter does not start with the button.
If the scooter does not, but starts from the kickstarter without problems (from the “leg”), then you should pay attention to the main fuse, which is located in the battery compartment.
This same fuse may be the cause. There was a real case when, when measuring the voltage at the battery terminals, 13 volts was displayed on the multimeter display. The norm, considering that the battery was slightly discharged.
When measuring the voltage after the fuse, the multimeter showed 12.8 volts. Wonderful, isn't it? Does a piece of wire (fuse) really drop 0.2 volts? In theory, this shouldn't happen. The voltage in the scooter's electrical network after the ignition switch was also measured. The voltage was a little more than 5 volts and was fluctuating. The turn signal relay also began to crackle ungodly after the scooter was started with the kickstarter and the turn signals were turned on.
Due to the fact that the fuse was made, to put it mildly, poorly, the wire inside the glass bulb barely touched the contact caps. Because of this, the electrical contact in the fuse was poor. This is where those 0.2 volts of voltage were lost.
Due to the fact that the turn relay received undervoltage, it crackled, since the supply voltage was sometimes enough to operate the electromagnetic relay, sometimes not.
Also, when pressing the “Start” button, the starter, which spins the engine shaft when starting, did not start. Naturally, since the voltage in the scooter's electrical network was underestimated due to a faulty fuse.
After replacing the faulty fuse, the scooter began to start with the “Start” button.
In case of such malfunctions, you should first check the integrity of the connecting conductors in the engine starting circuit. If you don't have a scooter wiring diagram handy, take a look here. There you will find a scooter wiring diagram that is suitable for almost all Chinese scooters.
Let's look at another problem.
The scooter does not start either from the start button or from the kickstarter.
What could be the problem?
Many people encounter this problem when they try to start a scooter after winter. In this case, the scooter seizes, but does not start. The electric starter turns, but something is missing to start the engine itself. The cause may be old fuel left in the gas tank. It is better to drain the old fuel and fill the tank with new one.
Another possible cause could be the spark plug and the wires that connect the CDI ignition module, ignition coil and spark plug.
First, it is better to check for the presence of the spark itself. You can do it like this.
To check the spark on a scooter you need to get to the spark plug. To do this you will have to remove the seat and find the cap.
The spark plug cap is removed with a little effort. It is attached to the candle with an elastic metal clip, which is built into the cap.
There is no need to twist the cap with the wire clockwise! Some people do this to remove the cap. This can damage the contact between the wire and the cap.
The spark plug can be unscrewed using a socket wrench. I filmed it like this.
Next is actually checking the spark.
We insert the spark plug into the cap and lean the outer metal edge of the spark plug against the metal body of the engine. Just like in the photo.
This is how we connect the negative, common contact of the spark plug with the common wire of the scooter's electrical wiring. Then we turn the spark plug so that we can see the gap where the spark should jump. Press the “Start” button, as we do when starting the engine. In this case, you will most likely need the help of another person. One is uncomfortable.
Reasons for lack of spark
Often, owners may encounter cases of starting failure in the cold season, although the moped drove well in the autumn. Initially, you need to unscrew the spark plug and carefully inspect for spark, oiliness and color.
Carbon deposits on the electrode
There may be no spark, if the electrode is covered with carbon deposits, then they are cleaned with a metal brush. If there is even the slightest doubt about the serviceability of the spark plug, you should replace it immediately, thereby making your life easier in the future.
Acidification of contacts
If the external signs of the spark plug correspond to suitability, and there is also no spark, then you need to check whether there is a discharge. It is worth noting that you need to be extremely careful, as it can give you an electric shock. If there is no spark and the external signs of the spark plug are normal, then the scooter is checked electronically for acidification of the contacts.
Insufficient fuel
If there is a spark, but the moped still has difficulty starting from the starter in cold weather, you should pay attention to the fuel tank. If it is empty, then it is filled. It is worth noting why old gasoline pours out of the carburetor float chamber. How to do it? There is a bolt at the bottom of the carburetor; it is unscrewed, and after all the fuel has flowed out, it is screwed back in. Before putting the moped in the garage in cold weather, fill the tank full of fuel.
Unscrew the bolt and pour out the old gasoline from the carburetor float chamber
If the above has been checked and done, and the scooter does not start well from the starter, then you can make the following repairs:
How to restore starting from the starter
The moped does not start well from the starter, however, doing it from the foot is simple and easy. If the engine does not start well from the starter, you must first check the fuse located in the battery compartment.
The location of the fuse on the battery is marked with an arrow.
Due to the often poor quality of the manufacture of the fuses, and, consequently, the entire starter, the wire located inside the starter glass bulb can barely touch the contact caps, which is why the fuse contact becomes unsuitable. After the low-quality fuse has been replaced, the moped can be started using the starter.
The scooter does not start from the starter - reasons and methods for solving the problem
A common problem is that a scooter or moped starts with a kickstarter, but refuses to start with an electric starter.
Let's consider all possible causes and methods for eliminating them. There may be several reasons why a scooter or moped does not start from the starter, both individually and in combination. Let's look at each of them:
Electric starter does not work
The scooter will not start from the starter if the electric starter itself is faulty. Everything is simple here. If the battery is serviceable and charged, the entire electrical circuit works, but when you press the starter button, only a click of the relay is heard, most likely the electric starter is faulty, or the contacts have come loose (oxidized).
It is very easy to check if the starter is working properly. Apply voltage to it directly from the battery, bypassing the starter relay. If the starter turns, then it is normal.
Starter relay does not work
The scooter will not start from the starter if the starter relay is not working. A faulty starter relay cannot start the starter, here everything is also simple and clear. If you do not hear the relay click when you press the starter button, it may be faulty. The relay needs to be replaced.
Starter button doesn't work
A failed electric starter button cannot close the circuit and supply power to the relay and starter, respectively. The button needs to be replaced. Sometimes wd-40 helps.
How to do your own engine repair
For a scooter engine to function properly, it requires the following components: spark, fuel and compression. The main slogan of a scooter mechanic is that miracles do not happen. Remember that in the process of troubleshooting and repairing a scooter, you can find out whether there is a spark and compression, or why there is no fuel flow. Therefore, if the engine does not start from the starter, then some component is missing or is in a faulty condition.
Many people are familiar with the situation when they are not only too lazy to take their scooter to a workshop, but also don’t want to pay for it all. Then you can repair everything yourself.
Start in the cold
First, let's fill up with fresh gasoline. Secondly, let’s replace the oil with synthetic, it thickens somewhat less in the cold than mineral water. Thirdly, try starting in the cold not with an electric starter, but with a kickstarter, since in this case it will be easier for the engine to overcome the difficulties associated with thick oil, stiff belts and gasoline that does not evaporate well in the cold. Also try giving a little more gas than usual when the engine starts. If you did everything correctly, the engine should not stall. If it doesn’t start or stalls immediately, then it may be worth heating the oil with a blowtorch.
If all these conditions are met, the engine should start even at a temperature of minus twenty. Don't forget to let the engine warm up for at least 5-10 minutes after starting. This is a simple starting diagram.
Sequence of repair actions
The main rule for detecting malfunctions and repairing a scooter is to step-by-step eliminate the elements of the system when identifying the causes of a breakdown in any of them. Search and repair, especially when starting from the starter, must be done in accordance with a strict sequence, where the chain may act as the beginning, and the end, for example, if there is or is no spark. It is worth noting that you do not need to immediately run for a new switch for the scooter, first make sure that the generator is functioning perfectly, only after that test the wiring if there is no spark, etc.
Main reasons
So, let's look at why the 4t scooter won't start - the reasons can be divided into the following categories:
Each of these 4 categories has its own several possible causes. When diagnosing a scooter, you should carefully pay attention to each category and the problem in it. Step by step, eliminating faults, you will definitely find the cause. And then it’s a matter of technology!
Advice! Remember that there may be several reasons. Therefore, having eliminated one breakdown, you should still check the serviceability of other devices from the list of possible faults.
Fuel system malfunctions
If there is no gasoline in the tank, the scooter will not start - everyone knows. The same situation occurs when the fuel system malfunctions - gasoline does not reach the combustion chamber. The consequence is that there is nothing to burn, so the engine does not start. The reasons may be as follows:
It is recommended to start repairs with the simplest ones. In this case, the diagnosis begins with the fuel tap (if there is gasoline in the tank). To check operation, remove the fuel supply hose from the carburetor, then crank the engine with the starter or crank. The serviceability of the tap will be visible by the stream of gasoline flowing from the hose.
A constant flow of fuel, even when the engine is stopped, or a lack of fuel supply through the hose indicates a breakdown of the fuel valve. If fuel is constantly leaking, change the valve immediately. Otherwise, you should pay attention to the condition of the fuel hoses, and only then replace the fuel tap.
Filter
The serviceability of the filter is diagnosed visually and by blowing. A dirty filter should be replaced immediately. If the filter looks clean, but does not blow in the desired direction, it means it is clogged and requires replacement.
Carburetor
A dirty carburetor is another reason why fuel does not reach the combustion chamber. The device becomes dirty due to poor filters (fuel and air) and poor fuel quality. Here is a list of actions necessary to eliminate carburetor malfunction:
Remember! There are no small details in carburetor repair! One missed moment may cost you to clean the entire carburetor again and find out the cause.
Ignition system malfunctions
Another possible reason why the engine does not work is a malfunction of the ignition system. This group includes many different little things, each of which can become the main reason for the engine not starting.
Spark plug
Let's start our search again with the simplest thing. Unscrew the spark plug from the cylinder, put a cap on it and lean the electrodes against the cylinder. Next, rotate the engine with the starter. In this case, a spark should jump between the two electrodes of the spark plug - straight and curved. If it is missing, you should perform a number of actions:
After completing these steps, check for spark again. If it appears, then you can try to start the engine. If there is no spark, replace the spark plug with a new one. If there is no spark on the new spark plug, you should pay attention to deeper problems.
High voltage wire
The most common problem with a wire is its exposure in a certain place (broken wire). A working wire should spark off the cylinder body or other metal part of the engine when the tip is removed.
If it’s not scary, you can check for voltage with your finger, but it’s better to rest it against the engine. A broken wire will conduct electricity at the break point without reaching the spark plug. The exposed area should be insulated or the wire replaced with a new one.
Ignition coil
To test the ignition coil, you need a device for measuring electrical quantities - a multimeter. Disconnect the coil from the scooter: remove the tip of the wire from the spark plug, unscrew the bolt securing the coil and disconnect its contacts.
Using a multimeter, measure the resistance at the coil contacts. Also measure the resistance between the contacts and the spark plug output. The optimal values for the coils of different scooters can be found by the model of the scooter. For example, the optimal resistance of the primary winding of the ignition coil on a Honda Dio scooter is 0.2-0.3 Ohm; secondary winding - 8.2-9.3 kOhm.
Piston group malfunctions
Having an insufficient degree of air compression in the engine cylinder, the scooter starts poorly or does not start at all. Experienced scooter riders can immediately determine the approximate compression level. A conclusion about the value of compression can be made by trying to start the moped with a kick starter.
When more effort is required in a certain position, it means compression is present. If the leg does not provide resistance, then the necessary pressure is not created in the cylinder. To be more sure, you should use a compression gauge.
Scooter won't start
Doesn't spark appear on the wire?
In most cases, a Chinese scooter will not start due to a current leak, that is, a spark does not flow to the wire at all. Experts note that the reason usually lies in insulation, which is missing in a certain place, which leads to the bare part touching the body of the scooter or another place where all the current goes. You need to solve the problem with diagnostics; first of all, inspect the entire high-voltage wire in order to find a bare spot.
If the wiring is intact, the reason for the lack of current will be more serious. Current will not flow to the spark plug for the following reasons:
The three above parts are the main ones in generating and supplying current to the spark plug, so any damage to them threatens to prevent the 4t scooter from starting. But if there is a spark, but your scooter does not want to start, move on to the next step - checking the fuel system.
Checking the fuel system
It is gasoline that plays the most important role in whether the scooter will start or not, so sometimes certain factors affect the supply of fuel to the carburetor and the engine itself. Fuel can be supplied either insufficient or in too much quantity, which in any case affects the performance of the scooter. The process of diagnosing the fuel system begins with the gas tank; check the presence of gasoline, its supply, and whether the hole is clogged.
After checking all the fuel lines and the valve for operability, we proceed to diagnosing the carburetor. This is often the cause of improper fuel supply; it is important to keep the carburetor in a fully tuned state without any dirt or other debris. Clean the carburetor and blow out all its channels; you will also have to adjust all the jets. If your 4T scooter does not start after cleaning the carburetor, you are most likely getting too much fuel.
If an excess of fuel is detected, you will see that the spark plug is quickly flooded, this does not allow a spark to form. You can verify this after diagnosing the fuel pump. If you disconnect the fuel hose and start the scooter with the kickstarter, a uniform amount of gasoline should come out of the hose. If the fuel pump does not work, the flow of fuel is uneven and there is too much fuel, replace or clean the pump.
Other reasons
In general, there are many reasons why a 4t scooter is difficult to start; this may be due not only to the fuel system and ignition; experts also point out that sometimes the scooter does not work due to a damaged CPG or lack of compression. If there is no compression, the piston will not create the necessary pressure to start the engine. In some cases, simply replacing the rings on the piston helps; in more advanced cases, you will have to replace the entire CPG.
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Quite often you can see cases when the owner is faced with the following problem: the scooter will not start. This may be due to a large number of reasons. Most often these are typical breakdowns or malfunctions, especially if the moped was parked in cold weather. Depending on the identified problem, the moped can be repaired in a few minutes or several hours.
Why the scooter does not start with the button - we identify the reasons
A scooter is a practical vehicle, economical and easy to drive. Modern models are reliable and easy to maintain, but various problems may arise during the operation of the scooter.
One of the most common breakdowns is the failure of the scooter to start with the button.
As a rule, at first the scooter starts from the button every other time , and then does not start at all using the electric starter. How to be in this case?
To fix a problem, you need to identify the cause of its occurrence. As practice shows, there can be many such reasons, but there are also quite common ones.
What to check if the scooter does not start with the button
We list the most common reasons and give ways to solve them:
Reasons for lack of spark
Often, owners may encounter cases of starting failure in the cold season, although the moped drove well in the autumn. Initially, you need to unscrew the spark plug and carefully inspect for spark, oiliness and color.
Carbon deposits on the electrode
There may be no spark, if the electrode is covered with carbon deposits, then they are cleaned with a metal brush. If there is even the slightest doubt about the serviceability of the spark plug, you should replace it immediately, thereby making your life easier in the future.
Acidification of contacts
If the external signs of the spark plug correspond to suitability, and there is also no spark, then you need to check whether there is a discharge. It is worth noting that you need to be extremely careful, as it can give you an electric shock. If there is no spark and the external signs of the spark plug are normal, then the scooter is checked electronically for acidification of the contacts.
Insufficient fuel
If there is a spark, but the moped still has difficulty starting from the starter in cold weather, you should pay attention to the fuel tank. If it is empty, then it is filled. It is worth noting why old gasoline pours out of the carburetor float chamber. How to do it? There is a bolt at the bottom of the carburetor; it is unscrewed, and after all the fuel has flowed out, it is screwed back in. Before putting the moped in the garage in cold weather, fill the tank full of fuel.
Unscrew the bolt and pour out the old gasoline from the carburetor float chamber
If the above has been checked and done, and the scooter does not start well from the starter, then you can make the following repairs:
How to restore starting from the starter
The moped does not start well from the starter, however, doing it from the foot is simple and easy. If the engine does not start well from the starter, you must first check the fuse located in the battery compartment.
The location of the fuse on the battery is marked with an arrow.
Due to the often poor quality of the manufacture of the fuses, and, consequently, the entire starter, the wire located inside the starter glass bulb can barely touch the contact caps, which is why the fuse contact becomes unsuitable. After the low-quality fuse has been replaced, the moped can be started using the starter.
If the scooter starts with the kickstarter, but does not start with the button
If the scooter starts without problems from the “leg”, but does not want to start from the electric start button, then you should pay attention to the central fuse (it is located in the compartment with the battery). If the voltage in the scooter’s electrical network is too low due to a faulty fuse, it will no longer start using the “Start” button.
To check the serviceability of the central fuse, you should measure the voltage at the battery terminals and compare with the voltage after the fuse.
If losses are detected during measurements, the fuse should be replaced. In most cases, after replacing the faulty fuse, the scooter starts without problems.
How to do your own engine repair
For a scooter engine to function properly, it requires the following components: spark, fuel and compression. The main slogan of a scooter mechanic is that miracles do not happen. Remember that in the process of troubleshooting and repairing a scooter, you can find out whether there is a spark and compression, or why there is no fuel flow. Therefore, if the engine does not start from the starter, then some component is missing or is in a faulty condition.
Many people are familiar with the situation when they are not only too lazy to take their scooter to a workshop, but also don’t want to pay for it all. Then you can repair everything yourself.
Keyless
In conclusion, let's talk about such an interesting situation as starting the engine in a situation where there is no key. Of course, this is not a guide to theft at all; this instruction may be useful to you if you have lost your keys. What to do in such a situation if you need to go urgently? In this case, the simplest solution would be to disassemble the ignition lock down to the cylinder itself and take it to a mechanic so that he can make you a new key. It doesn't take much time, you can do everything in just an hour.
Here's how to start your scooter without a key. The circuit is not complicated, and if you did everything correctly, your scooter can now be started without stalling.
Now you know what to do in situations if the scooter does not start. Especially how to start it if there is no spark. We are glad that now your scooter starts normally and does not stall. We wish you that the spark on the scooter does not disappear, and that the ignition is excellent.
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Sequence of repair actions
The main rule for detecting malfunctions and repairing a scooter is to step-by-step eliminate the elements of the system when identifying the causes of a breakdown in any of them. Search and repair, especially when starting from the starter, must be done in accordance with a strict sequence, where the chain may act as the beginning, and the end, for example, if there is or is no spark. It is worth noting that you do not need to immediately run for a new switch for the scooter, first make sure that the generator is functioning perfectly, only after that test the wiring if there is no spark, etc.
Checking Basic Systems
It is important to remember that gasoline has the ability to lose its properties if it sits in cold weather and may not even ignite. Also, before making a final diagnosis and starting to repair the moped, if it does not start from the starter, you need to make sure that the spark plug can do its job and the carburetor is functioning normally.
Remember that the scooter starts from the starter when it has an integral part with proper operation of the variator, clutch, camshaft group and valve. To put it simply, if all power systems are in normal condition, then there is a problem in the transmission, thanks to the crankshaft torque, which works closely with the variator.
In the process of diagnosing and repairing a scooter, in some cases it is necessary to do a thorough check of not only individual elements, but also the entire system. For example, if there is debris in the carburetor, provided that it is intact and the air filter is saturated, the presence of dirt in the cavity of the gas tank and the fuel filter is also carefully examined.
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Problems
Other possible reasons: - the mass does not contact well; — the switch is faulty; — the spark plug is poorly cleaned or the air filter is not working properly.
In any case, in such a situation, it is recommended to take the unit to a service station to show it to the technician. Or you can try to fix it yourself. For example, cleaning a carburetor is not that difficult if you have mechanical and electrical knowledge.
There can be worse breakdowns, for example, the pistons with rings may be faulty. Or the valves may need to be adjusted, and this is not a very simple matter for a novice motorcycle owner. The problem may also be that you start it cold and the oil has thickened. You may also need to set the ignition parameters correctly.
If the scooter does not start, experts recommend checking the ignition system. since this is the most common cause of abnormal engine starting. So, first, let's unscrew the spark plug and inspect it. If the spark plug is melted at the location of the electrodes, it must be replaced with a new one. If the candle is wet (the candle has been flooded?), then you must first remove it from the cap and then dry the candle. This can be done by simply leaving the candle in the sun or in a dry room for a while.
But you can speed up this process by drying the candle on a gas stove or burner. If you don't have them on hand, you can use a hairdryer. The dried spark plug needs to be put back into the cap and checked to see if there is a spark by placing the spark plug on the unpainted part of the engine and turning the kickstarter. If there is a spark, it is strong and powerful, blue in color, then everything is in order with the candle.
If the spark is weak, yellow or there is no spark, then you need to replace the spark plug with a new one. After installing the new spark plug, we try to start the engine. If it doesn't start, then the problem is not with the spark plug.
If there is no spark, it is worth checking the serviceability of the spark plug cap. In this case, you need to unscrew the cap from the wire and bring the wire to the metal part of the engine. Turn the crankshaft with the ignition on. If there is a spark, we eliminate the problem with connecting the cap and wire. And we try to start it again.
But if there is no spark on the wire, then a so-called “current leakage” is possible - a situation when somewhere a wire is exposed and touches a metal part of the engine. In this case, you need to find and fix this problem.
If everything is in order with the wire, but there is no spark, then more complex breakdowns may occur: - a problem with the ignition coil; — switch malfunction; - problem with the Hall sensor.
In this case, you will have to disassemble everything and replace it with an exactly working spare part. Or you can take your iron friend to a service station.
